Re: qemu-kvm 0.12.3, Slackware 13 host and Windows XP guest - time drift a lot

[Zachary Amsden <zamsden@redhat.com>]

On 03/17/2010 12:17 PM, Thomas Løcke wrote:
> On Wed, Mar 17, 2010 at 8:33 PM, Zachary Amsden<zamsden@redhat.com>  wrote:
>    
>> What's your host CPU load get up to.  You only have a single core?
>>      
> Dual core.
>
> If I only run a single Windows VM, the host load is pretty low. Sure
> it goes up a bit when for example copying a file, but it's nothing
> serious. It's not getting hammered in any way.
>
>    
>> Including -rtc-td-hack ?
>>      
> Yup, tried that as per suggested by one of the #kvm users. Didn't fix
> it. But come to think of it, I didn't change any of the other options.
> Should I have dropped -localtime and/or -tdf options? I will try again
> tomorrow.
>    

-rtc localtime

is required for Windows to get the proper RTC time, and -tdf should have 
no effect on Windows guests.

You might try

-rtc localtime,clock=host,driftfix=slew

>
>    
>> As always, make sure you are running the latest and greatest modules, those
>> matter even more than the kernel, and check for any warning messages in
>> dmesg and qemu output.
>>      
>
> But don't the latest kvm modules come with the kernel? So if I compile
> a new kernel, the kvm modules should be updated too, yes?
>
> I will try the latest qemu-kvm.
>    

I use git://git.kernel.org/pub/scm/virt/kvm/kvm-kmod.git and track a 2.6 
kernel branch directly so I always have latest module source regardless 
of host kernel.

Zach